The word Maseterine is misspelled against Masseterine, an adjective meaning "Masseteric."
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Masseterine has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings ma & eterine which should not be misspelled with single 'S'
Wrong Spelling:  ma-s-eterine 
Correct Spelling:  ma-ss-eterine 
Find more wrongly spelled words of Masseterine to spell it well.